We divide 731853 by 81
The aim is to understand the frequency of 81 in 731853.

Moving on to step 1:
7 divided by 81 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 81

Step 2:
When dividing 73 by 81, we get 0 with a remainder of 73.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 73 and we're left with 73.
Fetch the next digit (1) from the dividend, attach it to 73 and continue: 731 / 81

Going ahead to step 3:
If we divide 731 by 81, we get 9 and a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 729 away from 731, we end up with 2.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 81

Advancing to step 4:
81 goes into 28 0 times with a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 90.0
If we take 0 away from 28, we end up with 28.
Take the next digit (5) from the dividend and append it to 28, then repeat: 285 / 81

Going ahead to step 5:
81 can be fit into 285 3 times, resulting in a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 903.0
Deduct 243 from 285 and we're left with 42.
Bring next digit (3) of the dividend behind the 42 and repeat the process: 423 / 81

Let's proceed to step 6:
The number 81 fits into 423 5 times, leaving a remainder of 18.
The next digit of our result is 5. 
Result so far: 9035.0
If we subtract 405 from 423, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
81 goes into 180 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 9035.2
Subtracting 162 from 180 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 8:
81 can be fit into 180 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 9035.22
If we subtract 162 from 180, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 9035.22 with a remaining 0.018.